Bifacial solar modules

Bifacial solar modules, also known as double-sided solar modules, stand out from traditional solar modules with an innovative feature: they can use sunlight from both the front and back to generate electricity.

Functionality:

While conventional modules only rely on direct sunlight on the front, bifacial modules also capture the diffusely reflected light from the back. This is done through a transparent back that lets light through but reflects infrared radiation.

Construction:

Bifacial solar modules essentially consist of two components:

• Photovoltaic cells: The light-sensitive cells on the front and back convert sunlight into electrical current.
• Transparent back film: This film allows light to pass through while providing protection and stability.

Advantages:

The biggest advantage of bifacial solar modules is the significantly higher energy yield. By using light from both sides, they can generate up to 25% more electricity than traditional modules.

Other advantages include:

• Higher efficiency: Bifacial modules have higher efficiency because they can use more sunlight.
• More flexible installation: They can be installed on various roofs and open spaces as they do not rely solely on direct sunlight.
• Aesthetic appearance: Bifacial modules can give buildings a modern and attractive look.

Disadvantages:

In addition to the advantages, there are also some challenges that need to be taken into account with bifacial solar modules:

• Higher costs: Bifacial modules are slightly more expensive to purchase than conventional modules.
• Greater installation effort: Installation can be a little more complex due to the additional components.
• Susceptibility to dirt: The back must be kept clean to optimize power generation.
• Shading: Bifacial modules are more sensitive to shading than monofacial modules.

Conclusion:

Bifacial solar modules offer an innovative and efficient way to generate solar energy. The advantages in terms of energy yield and efficiency are convincing, but must be weighed against the higher costs and installation effort. Whether bifacial modules are the right choice depends on individual circumstances and needs.

Bifacial solar modules, also known as double-sided solar modules, are conquering the photovoltaic market with their innovative properties. Unlike traditional modules that only use light from the front, bifacial modules can also convert the energy of sunlight reflected from the back. This leads to a number of benefits that are attractive to both private households and businesses.

Higher energy yield: Probably the biggest advantage of bifacial solar modules is the significantly higher energy yield. By using light from both sides, they can generate up to 25% more electricity than traditional modules. This means that with a bifacial solar system you can generate significantly more energy with the same module area and thus reduce your electricity bill.

Better performance in unfavorable conditions: Bifacial modules show their strengths particularly in unfavorable lighting conditions. On cloudy days or in the morning and evening hours when direct sunlight is lower, they can continue to generate electricity effectively by using diffused light. This leads to a more consistent yield throughout the day and increases the efficiency of the entire solar system.

Higher efficiency: Because bifacial modules can use more sunlight, they achieve higher efficiency than conventional modules. This means they can get more energy from the same amount of sunlight.

More flexible installation: Bifacial modules offer greater installation flexibility. Since they do not rely exclusively on direct sunlight, they can also be installed on roofs and open spaces that are not optimally aligned with the sun.

Aesthetic appearance: Bifacial modules can give buildings a modern and attractive look. The elegant look and innovative technology make them an attractive choice for homeowners and businesses that value aesthetics.

Conclusion:

Bifacial solar modules offer a number of compelling benefits that make them an attractive investment for the future. The higher energy yield, better performance in unfavorable conditions, higher efficiency, flexible installation and aesthetic appearance make them a pioneering technology for solar power generation.

However, it should be noted that bifacial modules are slightly more expensive to purchase than conventional modules and the installation effort can be slightly higher. Nevertheless, the investment is worthwhile in many cases due to the higher efficiency and longer life cycle.

In addition to the promising advantages that bifacial solar modules bring, there are also some disadvantages and challenges that must be taken into account when purchasing and using this technology.

Higher cost:

The biggest disadvantage of bifacial solar panels is their higher price compared to traditional panels. The innovative technology and additional components usually increase the acquisition costs by 15% to 20%.

Higher installation effort:

The installation of bifacial modules can be a little more involved and complex due to the additional components and the sensitive back. This can lead to higher installation costs.

Susceptibility to dirt:

The back of the modules must be kept clean to ensure optimal power generation. Contamination from dust, snow or leaves can significantly reduce yields.

Shading:

Bifacial modules are more sensitive to shading than conventional modules. Since they require light from both sides, it is important that the modules receive sufficient sunlight throughout the day.

Limited suitability:

Bifacial modules are not ideal for all applications. The additional yield may be lower on roofs with a low slope or in densely built-up areas with little reflected light.

Maintenance effort:

Regular cleaning of the mod back may require additional maintenance.

Conclusion:

Although bifacial solar modules offer an innovative technology with high potential, the higher costs, the installation effort and the challenges mentioned must be taken into account when choosing this technology. A precise analysis of the circumstances and a comparison of the costs and the earnings potential are important in order to assess the economic viability in each individual case.

In some cases, such as B. on flat roofs or in areas with high sunlight and reflection, bifacial modules can still be a worthwhile investment. However, it is important to carefully weigh the advantages and disadvantages and check the suitability for the specific application.

The decision as to whether bifacial solar modules are worthwhile depends on a number of factors that take into account both the technical aspects and the economic framework.

Technical factors:

• Location: Bifacial modules are particularly suitable for locations with high levels of sunlight and diffuse light, such as in southern regions or on open spaces with light backgrounds.
• Roof pitch: The additional yield of bifacial modules can be particularly high on roofs with a steep pitch and south-facing orientation.
• Shading: Since bifacial modules are more sensitive to shading, they should be as free of trees, buildings or other obstacles as possible.
• Snow load: In snowy regions, the snow load on the back of the modules can be an additional factor that can complicate installation.

Economic factors:

• Investment costs: Bifacial modules are significantly more expensive to purchase than conventional modules. The investment costs should therefore be carefully weighed against the expected additional return.
• Funding opportunities: In many countries there are funding programs for the installation of solar systems. It is important to check whether bifacial modules are specifically funded in these programs.
• Electricity price: If the price of electricity is high, the additional yield from bifacial modules can be amortized more quickly.
• Self-consumption rate: The higher the self-consumption rate of the electricity generated, the greater the financial advantage of bifacial modules.

Rule of thumb:

A general rule of thumb is that bifacial solar modules are worthwhile if the expected additional yield offsets the additional costs within 5 to 8 years.

Recommendation:

It is advisable to seek advice from a professional before deciding on bifacial solar panels. An energy consultant can assess the conditions on site and carry out an individual cost-effectiveness calculation.

In summary, bifacial solar modules are a pioneering technology with high potential. Whether they are worthwhile in each individual case depends on a number of factors. A precise analysis of the technical and economic aspects is therefore essential.

The additional yield of bifacial solar modules, i.e. the additional electricity generated compared to conventional modules, can range from 5% to 30%. The exact amount of additional yield depends on a variety of factors that take into account the technical properties of the modules as well as the environmental conditions and usage behavior.

Influencing factors:

• Location: The geographical location and the surrounding area play a crucial role. In regions with high levels of sunlight and diffuse light, such as in southern Germany or in open spaces with light subsoil, the additional yield can be significantly higher.
• Roof pitch: Bifacial modules on roofs with a steep slope and a southerly orientation usually achieve a higher additional yield than modules on flat roofs or northerly.
• Reflective environment: The amount of sunlight reflected from the ground or surrounding buildings has a direct impact on additional yield. The brighter the environment, the more light can be used from the back of the modules.
• Shading: Bifacial modules are more sensitive to shading than conventional modules. The additional yield can be significantly reduced by shadows cast by trees, buildings or chimneys.
• Module technology: The type of solar cells used and the design of the modules influence the efficiency and thus the potential additional yield.
• Snow load: In snowy regions, the snow load on the back of the modules can reduce the additional yield because the modules receive less light from behind due to the snow.

Realistic expectations:

Under optimal conditions, such as B. in southern Germany on a free-standing south-facing roof with a light background, the additional yield from bifacial modules can actually be up to 30%. In practice, however, the average additional yield is usually between 10% and 20%.

Rule of thumb:

A good rule of thumb is that you can calculate with a realistic additional yield of 15%.

Conclusion:

The additional yield of bifacial solar modules is attractive, but can vary greatly depending on individual circumstances. It is therefore important to take the influencing factors into account and make a realistic assessment of the potential return.

In addition to the additional yield:

It is important to note that bifacial modules also offer other benefits such as: B. higher efficiency and more flexible installation. These benefits should also be taken into account in the overall evaluation of the technology.

The world of bifacial solar modules offers a diverse selection of types that differ in their properties and areas of application. Choosing the right module type depends on the specific requirements and framework conditions of the respective project.

1. According to cell technology:

• Perjiscale cells: This technology is the most widespread and established variant for bifacial solar modules. Periscale cells offer good value for money and high efficiency.
• Half-cell modules: These modules have two independent circuits on the front and back, improving performance in shaded conditions while reducing hot spot risks.
• Interdigitated Back Contact (IBC) modules: This technology is characterized by an innovative back contact that can significantly increase the efficiency and performance of the modules. However, IBC modules are usually more expensive than other types.

2. According to the construction method:

• Glass-Glass Modules: These modules offer the best durability and weather resistance as both the front and back are made of glass.
• Glass-film modules: These modules are a cheaper alternative to glass-glass modules, but use a film instead of the glass backing.
• Frameless modules: These modules offer a particularly aesthetic look and can achieve higher efficiency through better cooling.

3. Other distinguishing features:

• Performance: Bifacial solar modules are available in various performance classes, from small modules for rooftops to high-performance modules for power plants.
• Size: The size of the modules varies depending on the manufacturer and model.
• Warranty: The warranty conditions for bifacial solar modules may vary depending on the manufacturer and model.

Areas of application:

• House roofs: Bifacial solar panels are ideal for installation on house roofs as they can also benefit from reflected sunlight from the ground.
• Open-space systems: On open areas with light-colored surfaces, such as B. gravel or sand, bifacial modules can achieve a particularly high additional yield.
• Industrial roofs: Flat roofs of industrial buildings offer a large area for the installation of bifacial solar panels.
• Building integration: Bifacial solar modules can be integrated into the facade or roof of buildings, contributing to an aesthetically pleasing and energy-efficient solution.

Conclusion:

The variety of bifacial solar modules offers the right solution for every application. When choosing the right type of module, the specific requirements of the project, budget planning and the desired properties of the modules should be taken into account.

The market for bifacial solar modules is growing and more and more manufacturers are offering this technology. The renowned and established manufacturers of bifacial solar modules include:

German manufacturers:

• Solarwatt: A pioneer in the field of bifacial technology and known for its high-quality glass-glass modules.
• Heckert Solar: Offers a broad portfolio of bifacial modules for various applications.
• Hanwha Solar: A Korean manufacturer with production sites in Germany that offers high-efficiency bifacial modules.
• IBC Solar: Specializes in IBC modules that offer particularly high performance and high efficiency.

International manufacturers:

• LG Electronics: A Korean company that offers bifacial modules with high efficiency and innovative functions.
• Longi Solar: A Chinese manufacturer that is one of the largest manufacturers of solar modules in the world and also has bifacial modules in its range.
• Jinko Solar: Another major Chinese company that offers a wide range of bifacial modules for different applications.
• SunPower: A US manufacturer that offers high performance and premium quality bifacial modules.
• Q CELLS: A South Korean manufacturer that offers bifacial modules with innovative technology and high efficiency.

To note:

• In addition to these manufacturers, there are numerous other providers of bifacial solar modules.
• Choosing the right manufacturer should be based on factors such as quality, value for money, performance, warranty and customer service.
• It is advisable to obtain offers from different manufacturers and compare the module properties carefully.

Recommendation:

It is advisable to seek advice from a specialist before making a purchase decision. An energy consultant can assess the conditions on site, compare the different modules and make a recommendation for the right solution.

There are different ways to buy bifacial solar panels:

Online retailer:

• Prior PV: An online shop that you may be familiar with since you are currently on their site ;-)

Specialist dealer:

• Local photovoltaic dealers: In many cities and towns there are specialist dealers for photovoltaic systems who also offer bifacial modules and can help you plan and install your system.
• Roofers and energy consultants: Many roofers and energy consultants offer the installation of photovoltaic systems and can also provide you with bifacial modules.

Manufacturer:

• Some manufacturers of bifacial solar modules also offer direct sales to their customers. This can be a good option if you know exactly which modules you want and want to buy directly from the manufacturer.

To note:

• Prices for bifacial solar panels can vary depending on manufacturer, model and performance. It is therefore important to obtain offers from different providers and compare prices.
• When purchasing, pay attention to the quality of the modules and the warranty conditions.
• It is advisable to seek advice from a professional before purchasing. An energy consultant can help you determine the right size and power of panels for your needs and help you choose the right provider.

The installation of bifacial solar modules differs from the installation of conventional modules in several ways. There are some additional challenges and important considerations that need to be considered during installation to ensure optimal performance and lifespan of the modules.

1. Planning and Alignment:

• Roof pitch: Bifacial modules are particularly suitable for roofs with a steep pitch as they receive more light from both sides.
• Shading: Since bifacial modules are more sensitive to shading, they should be as free of trees, buildings or other obstacles as possible.
• Reflective environment: The environment of the roof plays an important role. Light-colored surfaces such as gravel or sand reflect more sunlight and can increase the additional yield of the bifacial modules.
• Module layout: The arrangement of the modules on the roof should be chosen so that the back receives as much light as possible.

2. Assembly:

• Greater installation effort: The installation of bifacial modules can be a little more time-consuming and complex due to the additional components and the sensitive back.
• Ventilation: The modules must be sufficiently ventilated to remove heat and moisture. This is particularly important for the back of the modules.
• Roof connection: The modules must be securely attached to the roof structure in order to withstand wind and snow loads.
• Grounding: Modules must be properly grounded to prevent lightning strikes.

3. Electrical installation:

• Inverter: Bifacial modules require a special inverter that can process the power generated by both sides.
• Wiring: The wiring must be carried out in such a way that the power generated from the rear is routed separately to the inverter.

4. Maintenance:

• Cleaning: The back of the modules must be cleaned regularly to optimize yield.
• Inspection: The modules should be checked regularly for damage and contamination.

Additional challenges:

• Heavier weight: Bifacial modules are typically heavier than traditional modules, which can make installation difficult.
• Snow load: In snowy regions, the snow load on the back of the modules can be an additional factor that can affect installation and roof structure selection.

Conclusion:

Installing bifacial solar panels requires careful planning and consideration of a few additional points. Professional installation and regular maintenance are important to ensure optimal performance and service life of the modules.

Recommendation:

It is advisable to have the installation of bifacial solar modules carried out by an experienced specialist company. A specialist can assess the conditions on site, take over the planning and carry out the installation professionally.

The promotion of bifacial solar modules in Germany takes place through various programs and measures. Below you will find an overview of the most important funding opportunities:

1. Investment support from KfW:

• KfW program 420 “Renewable Energy Standard”: This program offers low-interest loans and repayment subsidies for the installation of photovoltaic systems, including bifacial modules. The amount of funding depends on the performance of the system and the type of storage used. [invalid URL removed]
• KfW program 421 “Renewable Energies Premium”: This program offers higher funding than the KfW program 420, but stricter energy requirements must be met.

2. Degressive feed-in tariff:

• A feed-in tariff is paid for the electricity generated by bifacial solar modules in accordance with the Renewable Energy Sources Act (EEG). The amount of compensation depends on the time of installation and decreases over time.

3. Regional funding programs:

• Some federal states and municipalities offer additional funding programs for the installation of photovoltaic systems. These programs can e.g. B. subsidize the investment costs, the installation or the purchase of a storage system.

4. Other funding opportunities:

• There are various funding programs for the purchase of battery storage for photovoltaic systems. These storage systems make it possible to use self-generated electricity even when the sun is not shining.
• Installing a photovoltaic system can reduce property taxes.
• In some cases it may also be possible to receive funding from building insurance.

Important:

• The funding options change frequently. It is therefore important to find out about the current funding programs before installing a photovoltaic system.
• The use of funding is usually linked to certain conditions. It is therefore important to check the funding conditions carefully.
• It is advisable to seek advice from an expert to find the optimal funding for your project.

Conclusion:

The promotion of bifacial solar modules in Germany is diverse. With the right combination of funding programs and own funds, installing a photovoltaic system can be significantly cheaper.